#include <stdio.h>
#include <ctype.h>
#include <stdbool.h>
#define MAX_SRC 500

bool streq(char s1[], char s2[], int len){
    for(int i=0;i<len;i++){
        if(s1[i]!=s2[i]){
            return false;
        }
    }
    
    return s1[len] == '\0';
}

int main() {
    char src[MAX_SRC] = "#include <stdio.h>\nint main(){ printf(\"Hello world!\"); return 0;}";
    char out[MAX_SRC * 2];
    
    char *keywords[] = {"int", "return", "void", "if", "while", "do", "for", "char", "switch"};
    char *replacements[] = {"szam", "vissza", "ures", "ha", "amig", "csinald", "szamara", "karakter", "kapcsolo"};
	
	char* defines="#define ha if\n#define amig while\n#define csinald do\n#define szamara for\n#define ures void\n#define szam int\n#define karakter char\n#define kapcsolo switch\n#define vissza return\n";
    int num_keywords = 9;
    
    char buffer[100]={'\0'};
    int buffer_index=0;
	
	int char_index=0;
    
    int out_index=0;
	
	while(defines[out_index]!='\0'){
		out[out_index]=defines[out_index];
		out_index++;
	}
    
    while(src[char_index]!='\0'){
        char cur_char = src[char_index];
        if(isalnum(cur_char)){
            buffer[buffer_index]=cur_char;
            buffer_index++;
        } else {
            
            bool matching=false;
            for(int i=0;i<num_keywords;i++){
                if(streq(keywords[i],buffer,buffer_index)==true&&matching==false){
                    matching = true;
                    //printf("%s\n",buffer[i]);
                    
                    int j=0;
                    while(replacements[i][j]!='\0'){
                        out[out_index]=replacements[i][j];
                        out_index++;
                        j++;
                    }
                    break;
                }
            }
            
            if(matching==false){
                for(int i=0;i<buffer_index;i++){
                    out[out_index]=buffer[i];
                    out_index++;
                }
            }
            
            out[out_index]=cur_char;
            out_index++;
            
            for(int j=0;j<100;j++){
                buffer[j]='\0';
            }
            
            buffer_index=0;
        }
        
        char_index++;
    }
	out[out_index] = '\0';
    
    printf("out: %s",out);
    
   
    

    return 0;
}