SOLVED: Problem with Function that has to return a couple of blanc spaces

Projects Programming
1

I thought it should be easy to make a function that returns a couple of spaces.

I use a 4 line LCD to display positive and negativ temperatures. I want to have the decimal points at the same position.
Of course there are several solutions; for instance lcd.setCursor(x,y) depending of the length.
I prefer to insert 0, 1 or 2 blanc spaces, calculated by a function.

Normally I prepare each LCD-line by compiling a strLine; now I get a lot of errors: invalid conversion from 'const char*' to 'char' [-fpermissive]

strLine2 = "Tm  : " + Spaces(sngTm) + String(sngTm, 1) + " " + lcdDegrees + "C     ";

char Spaces(float Temp)
    {
    char extraSpaces; extraSpaces = "";
    //if (Temp=<-10) {extraSpaces[] = "";};
    if (Temp>-10 && Temp<0)  {extraSpaces = " ";};
    if (Temp>0 && Temp<10) {extraSpaces = "  ";};
    if (Temp>10) {extraSpaces = " ";};
    return extraSpaces;
    }
3

Thanks Delta_G.

I found the instruction dtostrf. Clearly explained in http://www.hobbytronics.co.uk/arduino-float-vars
Problem solved.

Instructions:

dtostrf(sngTm, 7,1,outstr);
strLine2 = "Tm  : " +  String(outstr) + lcdDegrees + "C     ";