C-Kurs/concat/Musterlösung

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

int string_length(char* string)
{
	int result = 0;
	while(string[result]!='\0')
		result++;
	return result;
}

char* concat(char *string1, char *string2)
{
	int len1 = string_length(string1);
	int len2 = string_length(string2);
	char* result = malloc(len1+1+len2+1);
	int i;	
	for(i=0; i<len1; i++)
		result[i] = string1[i];
	result[len1] = ' ';
	for(i=0;i<len2;i++)
		result[len1+i+1] = string2[i];
	result[len1+1+len2] = '\0';
	return result;
}

int main(int argc,char** argv)
{
	printf("TEST: %s\n",concat("Wort1","Wort2"));

	//Zusatz
	if(argc>=3)
	{	
		char *current = concat(argv[1],argv[2]);
		char *result = current;
		int i;
		for(i=3; i<argc; i++)
		{
			result = concat(current,argv[i]);
			free(current);
			current = result;
		}
		printf("PARAMETER: %s\n",result);
		return 0;
	}else{
		printf("Nicht genug Parameter");
		return -1;
	}
}