solution

src/main/java/core/basesyntax/SalaryInfo.java

@@ -1,7 +1,66 @@
 package core.basesyntax;
 
 public class SalaryInfo {
+    private static final int YEAR_INDEX = 2;
+    private static final int MONTH_INDEX = 1;
+    private static final int DAY_INDEX = 0;
+
     public String getSalaryInfo(String[] names, String[] data, String dateFrom, String dateTo) {
-        return null;
+        int[] dateFromArr = getDateInArrayIntegerFormat(dateFrom);
+        int[] dateToArr = getDateInArrayIntegerFormat(dateTo);
+
+        StringBuilder outputBuilder = new StringBuilder(
+                "Report for period " + dateFrom + " - " + dateTo);
+
+        for (String name : names) {
+            int salaryCounter = 0;
+            outputBuilder.append("\n");
+
+            for (String info : data) {
+                String[] infoArr = info.split(" ");
+
+                if (infoArr[1].equals(name)) {
+                    int[] dateEmploy = getDateInArrayIntegerFormat(infoArr[0]);
+
+                    if (workingUpToDate(dateEmploy, dateFromArr, dateToArr)) {
+                        salaryCounter += Integer.parseInt(infoArr[2])
+                                * Integer.parseInt(infoArr[3]);
+                    }
+                }
+            }
+
+            outputBuilder
+                    .append(name)
+                    .append(" - ")
+                    .append(salaryCounter);
+        }
+
+        return outputBuilder.toString();
+    }
+
+    private int[] getDateInArrayIntegerFormat(String date) {
+        int[] dateInArrayInteger = new int[3];
+        String[] dateInArrayString = date.split("\\.");
+
+        for (int i = 0; i < dateInArrayInteger.length; i++) {
+            dateInArrayInteger[i] = Integer.parseInt(dateInArrayString[i]);
+        }
+
+        return dateInArrayInteger;
+    }
+
+    private boolean workingUpToDate(int[] dateOfWork, int[] dateSalaryFrom, int[] dateSalaryTo) {
+        if (dateOfWork[YEAR_INDEX] >= dateSalaryFrom[YEAR_INDEX]
+                && dateOfWork[YEAR_INDEX] <= dateSalaryTo[YEAR_INDEX]) {
+            if (dateOfWork[MONTH_INDEX] >= dateSalaryFrom[MONTH_INDEX]
+                    && dateOfWork[MONTH_INDEX] <= dateSalaryTo[MONTH_INDEX]) {
+                return !(dateOfWork[MONTH_INDEX] == dateSalaryFrom[MONTH_INDEX]
+                        && dateOfWork[DAY_INDEX] < dateSalaryFrom[DAY_INDEX])
+                        && !(dateOfWork[MONTH_INDEX] == dateSalaryTo[MONTH_INDEX]
+                        && dateOfWork[DAY_INDEX] > dateSalaryTo[DAY_INDEX]);
+            }
+        }
+
+        return false;
     }
 }