diff --git a/AnimalProcessing/Fundamentals/exec.c b/AnimalProcessing/Fundamentals/exec.c
index f370bf5..c4b3d48 100644
--- a/AnimalProcessing/Fundamentals/exec.c
+++ b/AnimalProcessing/Fundamentals/exec.c
@@ -42,4 +42,5 @@ printf("%d\n", r1);
 
     int r2 = execute_me("wrong", argv);
     printf("%d\n", r2);
-}*/
+}
+*/
diff --git a/AnimalProcessing/Fundamentals/pipe.c b/AnimalProcessing/Fundamentals/pipe.c
index 8d5662e..866127f 100644
--- a/AnimalProcessing/Fundamentals/pipe.c
+++ b/AnimalProcessing/Fundamentals/pipe.c
@@ -44,7 +44,7 @@ void piped(){
         char buffer[2048];
         read(fd[0], buffer, sizeof(buffer));
         
-        printf("My child sends me : %s\n", buffer);
+        printf("My child sends me : %s", buffer);
         close(fd[0]); 
         wait(NULL);
 
diff --git a/AnimalProcessing/Fundamentals/wait.c b/AnimalProcessing/Fundamentals/wait.c
index 8e72937..b735f25 100644
--- a/AnimalProcessing/Fundamentals/wait.c
+++ b/AnimalProcessing/Fundamentals/wait.c
@@ -14,7 +14,7 @@ int fibo (int n){
 }
 int wait_child(int x){
 
-    if(x < 0) return -1;
+    if(x < 0) return 1;
 
     int wstatus;
     pid_t pid = fork();
diff --git a/AnimalProcessing/Proficiencies/dup.c b/AnimalProcessing/Proficiencies/dup.c
index a695ab5..0f08f81 100644
--- a/AnimalProcessing/Proficiencies/dup.c
+++ b/AnimalProcessing/Proficiencies/dup.c
@@ -25,19 +25,29 @@ int duper(char **argv, char *output){
     int wstatus;
     pid_t pid = fork();
 
-    if(pid < 0) return 1;
+    if(pid < 0) {
+
+        printf("Something went wrong in duper.\n");
+        return 1; 
+    }
 
     //Child
     else if (pid == 0){
 
         // ouverture en mode write 
         FILE *file = fopen(output, "w");
-        if(!file) exit(-1);
-
+        if(!file) {
+            printf("Something went wrong in duper.\n");
+            exit(-1);
+        }
         
         int fno = fileno(file);
-        if(dup2(fno, STDOUT_FILENO) == -1) exit(-1);
-        
+        if(dup2(fno, STDOUT_FILENO) == -1){
+            
+            printf("Something went wrong in duper.\n");
+            exit(-1);
+         }
+
         fclose(file);
 
         execvp(argv[0],argv);
diff --git a/AnimalProcessing/Proficiencies/project.c b/AnimalProcessing/Proficiencies/project.c
index 9135f6b..f34ceb3 100644
--- a/AnimalProcessing/Proficiencies/project.c
+++ b/AnimalProcessing/Proficiencies/project.c
@@ -65,17 +65,21 @@ int exec_cmd(char** args){
     int wstatus;
     pid_t pid = fork();
 
-    if (pid < 0) exit(-1);
+    if (pid < 0){
+        free(args);
+        exit(-1);
+    }
     // Child
     else if (pid == 0){
 
-        if(strcmp(args[0] , "run") != 0) exit(-1);
-        
-        if(execvp(args[1], args + 1) != 0) exit(-1);
-        exit(0);
-    
-        //if(execvp(args[0], args) == -1) exit(-1);
+        //if(strcmp(args[0] , "run") != 0) exit(-1);
+       
+        //on execute la commande et on return son code de fin
+        exit(execvp(args[1], args + 1));
+
+        //if(execvp(args[1], args + 1) != 0) exit(-1);
         //exit(0);
+    
     }
 
     //Uncle... You're again ! Oh it's not my uncle it's my daddy !