Added class to calculate Levenshtein distance

src/main/java/nl/fairbydesign/backend/ncbi/LevenshteinDistance.java

+package nl.fairbydesign.backend.ncbi;
+
+import java.util.Arrays;
+
+public class LevenshteinDistance {
+
+    static int compute_Levenshtein_distance (String str1, String str2) {
+        int[][] dp = new int[str1.length() + 1][str2.length() + 1];
+
+        for (int i = 0; i <= str1.length(); i++) {
+            for (int j = 0; j <= str2.length(); j++) {
+
+                if (i == 0) {
+                    dp[i][j] = j;
+                } else if (j == 0) {
+                    dp[i][j] = i;
+                } else {
+                    dp[i][j] = minm_edits(dp[i - 1][j - 1]
+                                    + NumOfReplacement(str1.charAt(i - 1),str2.charAt(j - 1)), // replace
+                            dp[i - 1][j] + 1, // delete
+                            dp[i][j - 1] + 1); // insert
+                }
+            }
+        }
+
+        return dp[str1.length()][str2.length()];
+    }
+
+    static int NumOfReplacement(char c1, char c2) {
+        return c1 == c2 ? 0 : 1;
+    }
+
+    static int minm_edits(int... nums) {
+        return Arrays.stream(nums).min().orElse(Integer.MAX_VALUE);
+    }
+
+}