#include <stdio.h>
#include <string.h>
#include <stdlib.h>

static int *strip(char *string) {

	char *buffer = malloc(strlen(string)+1);

	size_t j = 0;

	for (size_t c = 0; string[c] != '\0'; c++) {

		if (string[c] != ' ') {
			buffer[j++] = string[c];
		}



	}

	buffer[j] = '\0';
	return buffer;


}

int main() {

	char x[] = "h e l l o";

	char *val = strip(x);

	printf("%s", val);

	free(val);

	return 0;

}

/* Error :
$ gcc main.c
main.c: In function 'strip':
main.c:22:9: warning: return from incompatible pointer type [-Wincompatible-pointer-types]
  return buffer;
         ^~~~~~
main.c: In function 'main':
main.c:31:14: warning: initialization from incompatible pointer type [-Wincompatible-pointer-types]
  char *val = strip(x);
              ^~~~~
*/