Start from the end character and traverse till first.
Begin loop
if character index= first then
print string(current index)
else if character = ' ' then /*space*/
print string(current index)
print space
set character = delimiter /* Here I am cutting the string. You can call some garbage collecting function to free up the rest of the memory space*/
end if
End loop

/* This algorithm will just print the string in reverse worded way. But in case you need a reversed string you can go on appending whatever is printed here to the result string*/