integration of basic echo

Makefile

@@ -26,6 +26,7 @@ SRC = src/shell.c \
 	src/builtin/builtin_where.c \
 	src/builtin/builtin_alias.c \
 	src/builtin/builtin_unalias.c \
+	src/builtin/builtin_echo.c \
 	src/signal.c \
 	src/free_env.c \
 	src/utility/same_var.c \

include/builtin.h

@@ -28,6 +28,7 @@ int builtin_source(char **argv, env_t *env);
 int builtin_history(char **args, env_t *env);
 int builtin_alias(char **args, env_t *env);
 int builtin_unalias(char **args, env_t *env);
+int builtin_echo(char **args, env_t *env);
 //utility
 bool find_path_in_builtins(char *cmd);
 char **get_envpath(env_t *env);

src/builtin/builtin_echo.c

@@ -0,0 +1,25 @@
+/*
+** EPITECH PROJECT, 2020
+** builtin_echo.c
+** File description:
+** builtin_echo
+*/
+
+#include "builtin.h"
+#include <shell.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int builtin_echo(char **argv, env_t *env)
+{
+    for (int i = 1; argv[i]; i++) {
+        printf("%s", argv[i]);
+        if (argv[i + 1])
+            printf(" ");
+    }
+    printf("\n");
+    fflush(stdout);
+    env->vars = my_setenv(env->vars, "?", "0");
+    return (0);
+}

src/prompt.c

@@ -27,6 +27,7 @@ const builtin builtins[] = {
     {"source", &builtin_source},
     {"alias", &builtin_alias},
     {"unalias", &builtin_unalias},
+    {"echo", &builtin_echo},
     {NULL, NULL}
 };