gistfile1.c

#include <stdlib.h>

int main(int argc, char **argv)
{
	char *command;
	int i, size;

	size = 0;

	for (i=0; i<argc; i++) {
		size += strlen(argv[i]) + 1; // The size of that string + 1 for the space
	}

	command = malloc((sizeof(char) * size) + 1); // Allocate the size of all the strings + spaces + the last null character

	for (i=0; i<argc; i++) {
		strcat(command, argv[i]); // Append the string
		strcat(command, " "); // And a space
	}

	command[size] = '\0'; // Replace the last space with a null char to terminate the "string"

	printf("%s\n", command);

	return 0;
}