Renames function to use camel case.

Author: laurentaylormarshall

Slow Sort/SlowSort.swift

@@ -9,12 +9,12 @@
 func slowSort(_ i: Int, _ j: Int, _ numberList: inout [Int]) {
   guard if i < j else { return }
   let m = (i+j)/2
-  slowsort(i, m, &numberList)
-  slowsort(m+1, j, &numberList)
+  slowSort(i, m, &numberList)
+  slowSort(m+1, j, &numberList)
   if numberList[j] < numberList[m] {
     let temp = numberList[j]
     numberList[j] = numberList[m]
     numberList[m] = temp
   }
-  slowsort(i, j-1, &numberList)
+  slowSort(i, j-1, &numberList)
 }