Thread: Calling a function inside a function

i have the following code and the compiler is throwing error C2371: 'drawgraph' : redefinition; different basic types; on the header line of drawgraph(). I am relatively new to C so are you even allowed to do this? drawgraph isn't anywhere else in my program

Code:

void creategraph(int vertnumber){
	int i = 0, j =0;
	headedge = Create_Head_Edge();//create the head edge for the LL of edges
	head = Create_Vertices(vertnumber);//creates the number of verticies based on the arguments
	while(filevalues[i][j] != 0){//create the LL of edges
		headedge = Insert_Edge_by_ID(headedge, head, filevalues[i][0], filevalues[i][1]);
		i++;
	}
	drawgraph(head, headedge);	
}

void drawgraph(struct Vertex* temphead, struct Edge* tempheadedge){ <- the error is thrown here
	while(temphead != NULL){//traverses the LL
		DrawCircle(temphead->x, temphead->y, 10, 1, Blue);//draws the vertices to the screen
		temphead = temphead->next;//increment to the next vertex
	}
	
	while(tempheadedge != NULL){
		if(tempheadedge->next == NULL)
			break;
		DrawLine(tempheadedge->vertex1->x, tempheadedge->vertex1->y, tempheadedge->vertex2->x, tempheadedge->vertex2->y, Black);
		tempheadedge = tempheadedge->next;
	}
}