Initialization

• At the start, the sheet has 5 rows and 5 columns.
• Both rows and columns are 0-based.
• All cells are initially empty (no text, no style).

Methods

1) void addRow(int index)

• Insert a new empty row at index.
  Existing rows at index, index+1, … shift down by 1.
• Validity: 0 ≤ index ≤ currentRows.

• If currentRows = 5, addRow(5) appends at the end.
• addRow(0) makes the former row 0 become row 1, etc.

2) void addColumn(int index)

• Insert a new empty column at index.
  Existing columns at index, index+1, … shift right by 1.
• Validity: 0 ≤ index ≤ currentCols.

• If currentCols = 5, addColumn(5) appends at the end.
• addColumn(2) makes former col 2 become col 3, etc.

3) void addEntry(int row, int column, String text, String fontName, int fontSize, boolean isBold, boolean isItalic)

• Create or replace the entry at (row, column) with the given text and style.
• Validity: 0 ≤ row < currentRows and 0 ≤ column < currentCols.
• Input constraints:
  • text contains no hyphen -.
  • fontName will only contain lowercase characters from 'a' to 'z'
  • 8 ≤ fontSize ≤ 72.

4) String getEntry(int row, int column)

• Return the serialized content+style for the cell at (row, column).
• Format: text-fontName-fontSize[-b][-i]
  • Include -b only if isBold = true.
  • Include -i only if isItalic = true.
• Examples:
  • "some text example-tahoma-24-b"
  • "another text example-algerian-14-i"
  • "what are you waiting for-calibri-28-b-i"
  • "another day another dawn-pixar-21"
• Empty cell: return "".
• Validity: 0 ≤ row < currentRows, 0 ≤ column < currentCols.

Examples

Assume initial state is a 5×5 empty sheet (rows = 5, cols = 5).

1. Insert a row at the end and add an entry
   • addRow(5) → rows become 6 (new row index 5, all empty).
   • addEntry(5, 0, "hello", "tahoma", 24, true, false)
   • getEntry(5, 0) → "hello-tahoma-24-b"
2. Insert a column in the middle and verify shifting
   • addColumn(2) → cols become 6 (new empty column at index 2).
   • addEntry(0, 1, "x", "calibri", 10, false, true)
   • getEntry(0, 1) → "x-calibri-10-i"
   • After addColumn(1), the prior (0,1) shifts to (0,2):
     • getEntry(0, 2) → "x-calibri-10-i"
     • getEntry(0, 1) → ""
3. Replace existing entry
   • addEntry(5, 0, "greetings", "tahoma", 24, false, false)
   • getEntry(5, 0) → "greetings-tahoma-24"
4. Bold/Italic flags
   • addEntry(1, 3, "note", "algerian", 14, true, true)
   • getEntry(1, 3) → "note-algerian-14-b-i"
5. Empty cell check
   • getEntry(2, 2) → ""