So this would be the C code I need to implement into the code.

 if (strcmp(streakfile,"none") || strcmp(tracefile,"none"))
     Particlelines = SET_PARTICLES(N,pos1x,pos1y,pos2x,pos2y);
 Particlelines = INIT_PARTICLES(&N,imax,jmax,delx,dely,ppc,problem,U,V
+);

  SETBCOND(U,V,P,TEMP,FLAG,imax,jmax,wW,wE,wN,wS);
  SETSPECBCOND(problem,U,V,P,TEMP,imax,jmax,UI,VI);

struct particleline *INIT_PARTICLES (int *N,int imax,int jmax,
                                     REAL delx,REAL dely,
                                     int ppc,char *problem,REAL **U,RE
+AL **V)
{
 int i,j,ip,jp;
 struct particleline *Particlelines;
 REAL x,y;
 REAL height=0,rad=0,mpx=0,mpy=0,vstart=0; 

 if((Particlelines=(struct particleline *)
             malloc((unsigned)(*N) * sizeof(struct particleline))) == 
+NULL)
   {    
    printf("no memory");
    exit(0);
   }
 Particlelines -= 1;   /* Particlelines from 1 to N */

 for (i=1;i<=*N;i++)
   {
    Particlelines[i].length = 0;
    Particlelines[i].Particles = PARTALLOC(-1.,-1.);
   }

                       /* Set the particles */
 for (i=1;i<=imax;i++)
    for (j=1;j<=jmax;j++)
       for (ip=1;ip<=ppc;ip++)
         {
          x = (i-1)*delx+(ip-.5)/((REAL)ppc)*delx;
          for (jp=1;jp<=ppc;jp++)
        {
             y = (j-1)*dely+(jp-.5)/((REAL)ppc)*dely;
    
             if(strcmp(problem, "dam")==0)
                if (x<0.2*imax*delx)
                   SET_PART(&Particlelines[1],x,y);

             if(strcmp(problem, "drop")==0)
           {
                if (y<height)
          {
                   SET_PART(&Particlelines[1],x,y);
          }
                else if ((x-mpx)*(x-mpx)+(y-mpy)*(y-mpy) <= rad*rad)
          {
                   SET_PART(&Particlelines[2],x,y);
                   V[i][j] = vstart;
          }
           }
        }
     }
 return (Particlelines);
}


/*----------------------------------------------------------------*/
/* Add particle to "Partline" at (x,y)                              */
/*----------------------------------------------------------------*/
void SET_PART(struct particleline *Partline, REAL x,REAL y)
{
 struct particle *part;

 part =  PARTALLOC(x,y);                     /* create particle       
+*/
 part->next = (*Partline).Particles->next;   /* add it to "Partline"  
+*/
 (*Partline).Particles->next = part;         /* in the first position 
+*/ 
 (*Partline).length++; 
}
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